/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.pigpen.editor.commands;

import org.apache.pig.pigpen.editor.model.Operator;
import org.eclipse.gef.commands.Command;

/*
 * Adapted from code by Phil Zoio at http://www.eclipse.org/articles/Article-GEF-editor/gef-schema-editor.html
 */
public class ResetOperatorTextCommand extends Command {

    private Operator source;
    private String text, oldText;

    public void execute() {
        source.setText(text);
        source.reParse();
    }

    public boolean canExecute() {
        if (text != null) {
            return true;
        } else {
            text = oldText;
            return false;
        }
    }

    public void setText(String string) {
        this.text = string;
    }

    public void setOldText(String string) {
        this.oldText = string;
    }

    public void setSource(Operator operator) {
        source = operator;
    }

    public void undo() {
        source.setText(oldText);
        source.reParse();
    }
}
